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chandregowda
Joined: 07 Jul 2008
Posts: 149
Helped: 9
Location: Bengaluru/Bangalore, India
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 26 Aug 2008 12:59 compare: HFSS or Microwave CST |
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hi,
how do i make comparision between HfSS and Microwave CST (Performance-wise)
thanks in advance
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james cook
Joined: 04 Sep 2005
Posts: 200
Helped: 7
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| 27 Aug 2008 12:30 compare: HFSS or Microwave CST |
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| For small variation of structutre like simulating temperature drift, I prefer CST over HFSS.
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chandregowda
Joined: 07 Jul 2008
Posts: 149
Helped: 9
Location: Bengaluru/Bangalore, India
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| 27 Aug 2008 13:03 Re: compare: HFSS or Microwave CST |
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hi,
how are the results when compared to measured one?
(we are working on RF components and Antenna)
i am getting similar results in HFSS and measurements.
which one will take more simulation time?
thanks in advance
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rfmw
Joined: 10 May 2001
Posts: 478
Helped: 36
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| 27 Aug 2008 21:32 Re: compare: HFSS or Microwave CST |
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I done extensive comparison between the HFSS (FEM) and MWS (FDTD). My antenna model was relatively (electrically) large. HFSS used approx. 30GB of memory when solving (direct solver) and the MWS used approx 200M cells (50 hours of solving time) for the same problem.
My feeling is that the MWS required for the calculation less time, since discrete frequency sweep in the HFSS takes a long time. Which one is faster is difficult to say, you have to consider convergence you're satisfied with, computer you're going to use for the 3D solvers, are you interested in broadband or narrowband, etc. Other users might add some more...
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demian1977
Joined: 10 Jun 2006
Posts: 16
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| 28 Aug 2008 9:18 Re: compare: HFSS or Microwave CST |
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| If you need only few frequency point, and you have enough RAM, HFSS is the best. It's faster and more accurate. Else MWS can be usefull, but only if you use FIT and not tetraedral grid in frequency domain.
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madengr
Joined: 06 Apr 2005
Posts: 391
Helped: 84
Location: Kansas City
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| 28 Aug 2008 13:59 Re: compare: HFSS or Microwave CST |
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A couple of years ago I posted stripline benchmark results to compare 2.5D and 3D tools. I never did post the updated version with CST so here it is:
http://www.rfpoweramp.com/papers/stripline_benchmark_2.xls
If you skip to the last page in the spreadsheet you will see a comparison between HFSS and CST (both FD and TD solvers). The error for HFSS looks good at 100 seconds, however as mesh density (and analysis time) increase the error diverges. The error curves for the CST solvers are smooth and monotonically decreasing.
This is only one type of problem so you can't conclude one is better than the other. I prefer CST (we recently purchased it) since I can choose between TD and FD solvers.
When evaluating CST for purchase I gave them a patch antenna design that I simulated in HFSS and measured. All three agreed well but the CST TD solver was faster with less memory; I don't have specific numbers.
Now that I have access to both I want to try a log-periodic dipole array I designed in HFSS and measured. Since it's broadband it will make a good comparison between FD and TD solvers.
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